Can a bad coil pack ruin new spark plugs?

Can A Bad Coil Pack Ruin A Spark Plug? A faulty ignition coil can cause a misfire, which can also cause the spark plugs to malfunction. The spark plug or plug that was firing the bad coil should always be replaced. By doing this, we will be able to restore the power and fuel economy. via

How much does a coil pack cost?

What is this? In most cases, you will only need to replace the ignition coil that is bad, but you may get a better deal if you buy them in a pack. The cost of a single ignition coil averages about $20 to $40. The labor cost depends on the car model but will usually set you back around $50 to $100. via

Will a bad coil pack throw a misfire code?

They rarely throw codes (at least not hard codes) until they have been showing signs of failure for a very long time so it doesn't surprise me that you have no codes. via

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